Som SSBB related questions

I updated my USA Wii with the update on the JAP SSBB disc. Now I have the Japanese news and weather channels (along with the English ones). I thought that when I put the USA SSBB in that the English update would overwrite them. Alas, this wasn't the case. How can I get rid of these channels? Also, whenever I try to play the game, I get the "disc cannot be read" error right after it says "online mode not rated". I assume it's because I have the JAP update. Has anyone else that played the JAP version also been able to play the USA version?